Gregory John Nelson, MD
Emergency Medicine Physician · Summit, WI
Gregory John Nelson, MD is an emergency medicine physician with a practice address in Summit, Wisconsin, and NPI 1841299385, issued on Jul 18, 2005. Check the license on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Gregory John Nelson
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 9509 NV
Self-reported in NPPES; status is on the state search - Practice location
- 36500 Aurora Dr, Summit, WI 53066
- Phone
- (414) 454-6779
- Enumerated
- Jul 18, 2005
- Record last updated
- Sep 24, 2024
- Medicaid IDs
- 100180514 WI
002003754 NV
00G857910 CA
XPY193917 CA - Medicare enrollment
- Enrolled (PECOS I20100113000417); accepts Medicare assignment
- Medical or professional school
- University Of Minnesota Medical School, 1991
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,464 in Wisconsin → Look up another NPI →
Also registered at 36500 Aurora Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory John Nelson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
15% fewer Medicare Part D claims than the average emergency medicine physician in 2024
192 Medicare Part D claims for 131 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 31 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen25 claims
- Ondansetron Odt15 claims
- Cephalexin14 claims
- Prednisone14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Aurora Medical Group, Inc.Milwaukee, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory John Nelson among 1,464 emergency medicine physician records in Wisconsin
Gregory John Nelson, MD is one of 1,464 emergency medicine physician records with a practice address in Wisconsin. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 92% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1991 · median 2011 among the 844 with a school on file
- Record last updated2024 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 emergency medicine physician records list a practice address in Summit
They are 12 of the 250 NPPES records with a practice address in Summit, and 1,464 emergency medicine physician records in Wisconsin.
All 1,464 in Wisconsin → Every provider in Summit → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Steven Andrews, MDSummit, WI 530661649224767
- Christopher George, MDSummit, WI 530661437265865
- Jeffery Glaspy, MDOconomowoc, WI 530661619925237
- James Harper, M.D.Oconomowoc, WI 530661922132364
- Timothy Hill, M.D.Oconomowoc, WI 530661861478430
- Mark Hlava, MDSummit, WI 530661821048224
- Michael Kefer, M.D.Summit, WI 530661457337891
- Eric Moore, MDSummit, WI 530661417156142
Common questions
What is Gregory John Nelson, MD's NPI number?
Gregory John Nelson, MD's National Provider Identifier (NPI) is 1841299385, issued on Jul 18, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Gregory John Nelson, MD located?
The NPPES record lists a practice address at 36500 Aurora Dr, Summit, WI, 53066. Phone: (414) 454-6779. Providers update this record themselves, so call before visiting.
How can I verify Gregory John Nelson, MD's license?
Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory John Nelson, MD prescribe under Medicare Part D?
In 2024, Gregory John Nelson, MD had 192 Medicare Part D claims for 131 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.